sparkplugb

package module

v0.2.3 Latest Latest Go to latest Published: Oct 31, 2026 License: MIT Imports: 8 Imported by: 0

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github.com/otfabric/go-sparkplugb

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README ¶

go-sparkplugb

Production-quality Eclipse Sparkplug B 3.0.0 library for Go.

go-sparkplugb handles the full Sparkplug B 3.0.0 protocol lifecycle for Edge Nodes, Host Applications and Applications: topic namespace, Protobuf codecs, typed metrics (including arrays, templates and datasets), sequence numbering, alias management, birth/death certificates, primary host awareness with server walking, and message reordering. It ships an MQTT transport over Eclipse Paho, which asks for MQTT 3.1.1 and falls back to 3.1 if the broker refuses it, and has no MQTT 5. Any other MQTT client plugs in through the mqtt.Transport interface.

Quick links: Install · Edge Node · Host Application · Application · Packages · Comparison · Compatibility · Examples · Conformance · Related projects

Features

Category	Details
Edge Node runtime	Full lifecycle (birth/death/rebirth), sequence numbering, alias support, primary host awareness, server walking across multiple brokers
Host Application runtime	STATE birth/death certificates, node/device registry, sequence validation, out-of-order messages held and applied in `seq` order, rebirth requests (at most one pending per node), reorder timeout
Application runtime	Non-primary-host consumer: subscribes to spBv1.0/#, tracks nodes/devices, alias resolution, sends NCMD/DCMD — no STATE messages
Typed metric codec	All scalar types, signed-integer handling (Int8–Int64 in wire fields), all array types (little-endian packed, bit-packed BooleanArray, null-terminated StringArray, DateTimeArray), quality codes
Templates	Template definitions (is_definition, version, member metrics, parameters) and instances (template_ref, parameter overrides)
DataSets	Columnar data with typed columns (num_of_columns, columns, types, rows), round-trip encode/decode
Topic namespace	Parser and builder for `spBv1.0/{group}/{type}/{node}/[{device}]` with validation
Observability	Pluggable `Logger` (`log/slog`, standard `log`) and `Metrics` callbacks per role; `context.Context` on every blocking call
Protobuf types	Generated from the canonical Eclipse Tahu `sparkplug_b.proto` (pinned commit, SHA-256 verified)
MQTT transport	`mqtt.Transport` interface; Eclipse Paho adapter included (MQTT 3.1.1, with fallback to 3.1, over TCP, TLS or WebSocket; no MQTT 5)

go-sparkplugb vs other Sparkplug B stacks

go-sparkplugb is tested against five other implementations (see the compatibility matrix). All are good libraries; this table compares them, to help you pick the right one for your project.

Capability	otfabric/go-sparkplugb	Eclipse Tahu (Java)	pysparkplug	SparkplugNet	srad	sparkplughost
Language	Go	Java	Python	C#	Rust	Go
License	MIT (`proto/` EPL-2.0)	EPL-2.0	Apache-2.0	MIT	MIT or Apache-2.0	Apache-2.0
Edge node	✅	✅	✅	✅	✅	—
Primary host application (STATE)	✅	✅	— ¹	✅	✅	✅
Application without STATE	✅	✅	✅ plain client	✅	—	—
STATE of Sparkplug 3.0 / 2.2	3.0	3.0	3.0	3.0 and 2.2	3.0	3.0
MQTT	3.1.1 with fallback to 3.1 (Paho), any client through `mqtt.Transport`	3.1.1 (Paho)	3.1.1 and 5 (paho-mqtt)	3.1.1 and 5 (MQTTnet)	5 (rumqttc)	3.1.1 (Paho)
TLS, WebSocket	✅ ✅	by URL scheme, no TLS settings	✅ ✅	✅ ✅	not documented	✅ TLS
Edge: devices	✅	✅	✅	✅	✅	—
Edge: metric aliases	✅ caller-assigned	✅ generated	✅ caller-assigned	✅ caller-assigned	✅	—
Edge: births wait for the primary host's STATE	✅	✅	—	— ²	— ³	—
Edge: server walking when the primary host goes offline	✅	✅	—	—	— ³	—
Host: `seq` check with rebirth request	✅	✅	—	—	✅	✅
Host: out-of-order messages held and resequenced	✅ across the NBIRTH too, configurable timeout	✅ fixed 5 s	—	—	✅ default 3 s	✅ default 5 s
Host: NDEATH of an earlier session (`bdSeq`) ignored	✅	✅	—	—	✅	✅
Typed scalars and arrays	✅	✅	✅	✅	✅	— raw protobuf
DataSet	✅	✅	—	✅	raw protobuf only	— raw protobuf
Template, definition and instance	✅	✅	—	✅	✅	— raw protobuf
Properties and property sets	✅	✅	—	✅	✅	— raw protobuf
Cancellation	`context.Context` per call	— callbacks, timers	— callbacks	`CancellationToken`	async (tokio)	`context.Context` on `Run`
Logging	`log/slog` or standard `log`, plus metrics callbacks	SLF4J	`logging`	`Microsoft.Extensions.Logging`	`log` crate	`log/slog`

¹ pysparkplug decodes STATE but has no host application; the application publishes STATE itself. ² SparkplugNet's edge subscribes to the primary host's STATE but publishes its births at once. ³ srad's edge ignores STATE; waiting for the primary host and several brokers are on its to-do list.

✅ = available · — = not available. For Eclipse Tahu 1.0.21, pysparkplug 0.6.1, SparkplugNet 1.4.1, srad 0.5.0 and EvergenEnergy/sparkplughost v0.4.0, the versions go-sparkplugb is tested against, from their source at those tags as of October 2026. If you spot an inaccuracy, please open an issue and we will correct it.

Choose go-sparkplugb if you write Go and want all three roles in one library: an edge node that follows its primary host across brokers, a host that copes with brokers that reorder messages, the full datatype set including DataSets and Templates, and context control.

Choose Eclipse Tahu if you are on the JVM and want the reference implementation of the Eclipse Sparkplug project.

Choose sparkplughost if you need only a Go host application and work with the raw protobuf types.

Compatibility matrix

Every role of go-sparkplugb runs on every push against the six reference stacks of sparkplugb-interop v0.1.0, on four MQTT brokers, with the images pinned by digest in interop/images.go.

Reference	Version	go-sparkplugb host and application ← reference edge	go-sparkplugb edge → reference host
Eclipse Tahu (Java)	1.0.21	✅	✅
pysparkplug	0.6.1	✅ ¹	✅ ² ⁵
SparkplugNet	1.4.1	✅ ³	✅ ⁴
srad	0.5.0	✅	✅ ⁵
Eclipse Tahu sparkplug-client (JavaScript)	3.2.4	✅	(edge only)
EvergenEnergy/sparkplughost	v0.4.0	(host only)	✅ ⁵

Broker	Version	Result
Eclipse Mosquitto	2.1.2	✅
HiveMQ CE	2026.5	✅
EMQX	6.3.2	✅
NanoMQ	0.25.7	✅

✅ = every step passes, except the steps that need a capability the reference lacks or that hit one of its upstream bugs: ¹ pysparkplug's NDEATH carries the next bdSeq: the will after a crash is checked instead. ² pysparkplug's host cannot decode a negative Int8 or Int16 sign-extended to 32 bits, a specification ambiguity: the scalars fixture is skipped. ³ without device writes: SparkplugNet's edge drops a DCMD for a device. ⁴ without the steps after a death: SparkplugNet's host keeps dead nodes online. ⁵ not on NanoMQ and HiveMQ CE: these brokers reorder a node's messages across topics, which these hosts do not resequence across the NBIRTH.

Each step (births, aliases, updates of all fourteen scalar datatypes, NCMD and DCMD writes, rebirth, device death and birth, NDEATH, the will, the primary host going offline) and the wire behaviour are described in INTEROPERABILITY.md. Run it with make interop (Docker).

Installation

go get github.com/otfabric/go-sparkplugb

Requires Go 1.26 or later.

Packages

Package	Import	Description
`proto`	`github.com/otfabric/go-sparkplugb/proto`	Generated Protobuf types (EPL-2.0)
`topic`	`github.com/otfabric/go-sparkplugb/topic`	Topic namespace parsing, construction and validation
`payload`	`github.com/otfabric/go-sparkplugb/payload`	Typed metric encoding/decoding, templates, datasets, arrays, quality codes
`edge`	`github.com/otfabric/go-sparkplugb/edge`	Edge Node runtime (lifecycle, sequencing, aliases, server walking)
`host`	`github.com/otfabric/go-sparkplugb/host`	Host Application runtime (STATE, registry, seq validation, reorder timeout)
`app`	`github.com/otfabric/go-sparkplugb/app`	Application runtime (subscriber, node tracking, commands — no STATE)
`mqtt`	`github.com/otfabric/go-sparkplugb/mqtt`	MQTT transport interface and Paho adapter

Quick Start — Edge Node

package main

import (
    "context"
    "log"

    "github.com/otfabric/go-sparkplugb/edge"
    "github.com/otfabric/go-sparkplugb/mqtt"
    "github.com/otfabric/go-sparkplugb/payload"
    pb "github.com/otfabric/go-sparkplugb/proto"
)

func main() {
    transport := mqtt.NewPahoTransport()

    node, _ := edge.New(transport, edge.Config{
        GroupID:    "plant",
        EdgeNodeID: "gateway-01",
        BrokerURL:  "tcp://broker:1883",
    })

    ctx := context.Background()
    node.Connect(ctx)
    defer node.Close(ctx)

    temp, _ := payload.NewMetric("temperature", pb.DataType_Double, float64(22.5))
    node.PublishBirth(ctx, []*pb.Payload_Metric{temp})

    // Report by exception
    updated, _ := payload.NewMetric("temperature", pb.DataType_Double, float64(23.1))
    node.PublishNodeData(ctx, []*pb.Payload_Metric{updated})
}

Quick Start — Host Application

app, _ := host.New(transport, host.Config{
    HostID:    "scada-01",
    BrokerURL: "tcp://broker:1883",
    OnNodeBirth: func(group, node string, metrics []*pb.Payload_Metric) {
        log.Printf("node online: %s/%s with %d metrics", group, node, len(metrics))
    },
    OnNodeDeath: func(group, node string) {
        log.Printf("node offline: %s/%s", group, node)
    },
})

app.Connect(ctx)
defer app.Close(ctx)

Quick Start — Application

An Application subscribes to the Sparkplug namespace and tracks edge nodes/devices without publishing STATE birth/death certificates. Use it for dashboards, loggers, analytics pipelines, or any consumer that does not need to be a Primary Host.

application, _ := app.New(transport, app.Config{
    BrokerURL: "tcp://broker:1883",
    OnNodeBirth: func(group, node string, metrics []*pb.Payload_Metric) {
        log.Printf("node online: %s/%s with %d metrics", group, node, len(metrics))
    },
    OnNodeData: func(group, node string, metrics []*pb.Payload_Metric) {
        log.Printf("data from %s/%s: %d metrics", group, node, len(metrics))
    },
    OnNodeDeath: func(group, node string) {
        log.Printf("node offline: %s/%s", group, node)
    },
})

application.Connect(ctx)
defer application.Close(ctx)

// Send a command to an edge node
application.SendNodeCommand(ctx, "plant", "gw1", []*pb.Payload_Metric{rebirth})

Quick Start — Templates

// Define a template with member metrics and parameters.
tempMetric, _ := payload.NewMetric("temperature", pb.DataType_Double, float64(0))
unitParam, _ := payload.NewTemplateParameter("unit", pb.DataType_String, "celsius")

def, _ := payload.NewTemplateDefinition("SensorTemplate", "1.0",
    []*pb.Payload_Metric{tempMetric},
    []*pb.Payload_Template_Parameter{unitParam})

// Create an instance with parameter overrides.
instMetric, _ := payload.NewMetric("temperature", pb.DataType_Double, float64(72.5))
instParam, _ := payload.NewTemplateParameter("unit", pb.DataType_String, "fahrenheit")

inst, _ := payload.NewTemplateInstance("sensor1", "SensorTemplate",
    []*pb.Payload_Metric{instMetric},
    []*pb.Payload_Template_Parameter{instParam})

Quick Start — DataSets

columns := []string{"name", "value", "active"}
types := []pb.DataType{pb.DataType_String, pb.DataType_Double, pb.DataType_Boolean}
rows := [][]any{
    {"sensor1", float64(22.5), true},
    {"sensor2", float64(33.1), false},
}

m, _ := payload.NewDataSet("readings", columns, types, rows)

// Extract after decode
cols, dts, gotRows, _ := payload.GetDataSetValues(m)

Examples

Runnable examples are in the examples/ directory:

Example	Description
`examples/edge-node`	Edge Node with birth, device birth, and periodic data publishing
`examples/host-app`	Host Application with node/device lifecycle callbacks
`examples/templates`	Template definitions and instances with parameter overrides
`examples/datasets`	DataSet metrics with typed columnar data
`examples/application`	Application (non-host subscriber) with node/device event tracking
`examples/aliases`	Edge Node with metric aliases and alias resolution
`examples/commands`	Host Application sending NCMD and DCMD commands to edge nodes
`examples/server-walking`	Edge Node with multi-broker ServerURLs and primary host awareness

Run any example with:

MQTT_BROKER=tcp://localhost:1883 go run ./examples/edge-node

Configuration

Edge Node Config

Field	Type	Default	Description
`GroupID`	`string`	required	Sparkplug group identifier
`EdgeNodeID`	`string`	required	Edge node identifier
`BrokerURL`	`string`		MQTT broker URL (`tcp://`, `ssl://`)
`ServerURLs`	`[]string`		Multiple broker URLs for server walking
`Username`, `Password`	`string`		Broker login, for every server. A `Password` needs a `Username`. Never logged; use `ssl://`
`ClientID`	`string`	`sparkplug_<group>_<node>`	MQTT client ID
`PrimaryHostID`	`string`		Primary Host Application ID: births wait for its STATE online; its STATE offline makes the node disconnect and walk to the next server
`BdSeqStore`	`BdSeqStore`	in memory	Where `bdSeq` is kept across restarts
`RetryPolicy`	`sparkplugb.RetryPolicy`	`ExponentialBackoff{}`	Reconnect policy while walking servers
`Logger`	`sparkplugb.Logger`	none	Logger (`NewSlogLogger`, `NewStdLogger`)
`Metrics`	`edge.Metrics`	none	Connect, publish, message and state-change callbacks
`OnState`	`func`		State change callback
`OnNodeCmd`	`func`		NCMD received callback
`OnDeviceCmd`	`func`		DCMD received callback

Aliases are set by the caller on the birth metrics (Alias); data may then carry the alias only, and ResolveAlias maps it back.

Host Application Config

Field	Type	Default	Description
`HostID`	`string`	required	Host Application identifier
`BrokerURL`	`string`		MQTT broker URL
`ServerURLs`	`[]string`		Multiple broker URLs
`Username`, `Password`	`string`		Broker login, for every server. A `Password` needs a `Username`. Never logged; use `ssl://`
`ClientID`	`string`	`sparkplug_host_<host id>`	MQTT client ID
`ReorderTimeout`	`time.Duration`	`0`	How long a `seq` gap may stay open before a rebirth request; `0` requests it at once
`Logger`	`sparkplugb.Logger`	none	Logger
`Metrics`	`host.Metrics`	none	Connect, message, state-change, node birth and death callbacks
`OnState`	`func`		State change callback
`OnNodeBirth`	`func`		NBIRTH callback
`OnDeviceBirth`	`func`		DBIRTH callback
`OnNodeData`	`func`		NDATA callback
`OnDeviceData`	`func`		DDATA callback
`OnNodeDeath`	`func`		NDEATH callback
`OnDeviceDeath`	`func`		DDEATH callback

Application Config

Field	Type	Default	Description
`BrokerURL`	`string`		MQTT broker URL
`ServerURLs`	`[]string`		Multiple broker URLs (fallback)
`Username`, `Password`	`string`		Broker login, for every server. A `Password` needs a `Username`. Never logged; use `ssl://`
`ClientID`	`string`	`sparkplug_app_<n>`	MQTT client ID
`Logger`	`sparkplugb.Logger`	none	Logger
`Metrics`	`app.Metrics`	none	Connect, message, state-change, node birth and death callbacks
`OnState`	`func`		State change callback
`OnNodeBirth`	`func`		NBIRTH callback
`OnDeviceBirth`	`func`		DBIRTH callback
`OnNodeData`	`func`		NDATA callback
`OnDeviceData`	`func`		DDATA callback
`OnNodeDeath`	`func`		NDEATH callback
`OnDeviceDeath`	`func`		DDEATH callback

Connection loss

Edge nodes, host applications and applications move to Disconnected (and fire OnState) as soon as the transport reports the connection gone — a broker drop, a client-ID takeover, or Disconnect called on the transport directly. Call Connect again to resume; edge nodes bump bdSeq and must re-publish NBIRTH. Custom mqtt.Transport implementations report this by calling ConnectOpts.OnConnectionLost with an error wrapping mqtt.ErrConnectionLost.

Specification Conformance

This library targets full conformance with the Eclipse Sparkplug B 3.0.0 specification. See docs/CONFORMANCE.md for the clause-by-clause requirements matrix.

Conformance Summary

Profile	Mandatory	Optional
Edge Node	Session, Termination, Data, Commands, Primary Host, Multi-Broker	Aliases, Templates, DataSets, Properties
Host Application	Session, Termination, Commands, Edge Termination; Multi-Broker partial (`ServerURLs`, one broker at a time)	Message Reordering
Application	Subscribe, Track State, Alias Resolution, Seq Validation, Commands	—

Project Structure

go-sparkplugb
├── proto/            Generated Protobuf types (EPL-2.0)
├── topic/            Topic namespace parsing and construction
├── payload/          Typed metric codec, templates, datasets, arrays
├── edge/             Edge Node runtime
├── host/             Host Application runtime
├── app/              Application runtime (non-host consumer)
├── mqtt/             MQTT transport interface and Paho adapter
├── interop/          Interop suite against sparkplugb-interop (own module, Docker)
├── examples/
│   ├── edge-node/        Edge Node lifecycle
│   ├── host-app/         Host Application lifecycle
│   ├── templates/        Template definitions and instances
│   ├── aliases/          Metric aliases and alias resolution
│   ├── application/      Application (non-host consumer)
│   ├── commands/         Sending NCMD and DCMD commands
│   ├── datasets/         DataSet columnar metrics
│   └── server-walking/   Multi-broker server walking
├── docs/
│   ├── CONFORMANCE.md    Specification conformance matrix
│   ├── LICENSING.md      License details
│   └── RESEARCH.md       Design research
├── INTEROPERABILITY.md   Wire behaviour and the interop matrix
└── RELEASE.md            Release notes

Building and Development

Target	Description
`make test`	Run all tests
`make cover`	Run tests with coverage report
`make lint`	Run staticcheck
`make lint-ci`	Run golangci-lint
`make e2e`	The runtimes over Paho against a fake broker on loopback TCP
`make bench`	Benchmarks
`make build`	Build examples
`make check`	Lint + test + coverage gate (90%)
`make interop`	Edge, host and application against the six reference stacks of sparkplugb-interop, on Mosquitto, HiveMQ CE, EMQX and NanoMQ (`interop/` module, Docker)

git clone https://github.com/otfabric/go-sparkplugb.git
cd go-sparkplugb
make check

License

Original OT Fabric code is MIT licensed. The proto/ directory contains code derived from the Eclipse Tahu project under EPL-2.0. See docs/LICENSING.md for details.

Documentation ¶

Index ¶

type ExponentialBackoff
- func (b ExponentialBackoff) Delay(attempt int) time.Duration
- func (b ExponentialBackoff) ShouldRetry(attempt int, err error) (bool, time.Duration)
type FieldLogger
- func NewSlogLogger(h slog.Handler) FieldLogger
- func NewStdLogger(l *log.Logger, debug bool) FieldLogger
type Logger
- func ComponentLogger(l Logger, name string) Logger
- func NopLogger() Logger
type RetryPolicy
- func NoRetry() RetryPolicy

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type ExponentialBackoff ¶

type ExponentialBackoff struct {
	// Initial is the delay after the first failure; 500 ms when zero.
	Initial time.Duration
	// Max caps the delay; 30 s when zero.
	Max time.Duration
	// Attempts is the number of retries; 5 when zero, unbounded when
	// negative.
	Attempts int
	// NoJitter waits the delay itself, for tests.
	NoJitter bool
}

ExponentialBackoff is the RetryPolicy that retries after a delay that doubles from Initial up to Max, with jitter: the wait is drawn at random between half of the delay and the delay, so that devices that failed together do not come back together.

The zero value retries up to 5 times from 500 ms (Attempts 5, Initial 500 ms, Max 30 s).

func (ExponentialBackoff) Delay ¶

func (b ExponentialBackoff) Delay(attempt int) time.Duration

Delay returns the wait after the failure of attempt, regardless of the error and of Attempts.

func (ExponentialBackoff) ShouldRetry ¶

func (b ExponentialBackoff) ShouldRetry(attempt int, err error) (bool, time.Duration)

ShouldRetry implements RetryPolicy.

type FieldLogger ¶

type FieldLogger interface {
	Logger
	With(kv ...any) FieldLogger
}

FieldLogger is a Logger that keeps fields (key-value pairs) with its lines: With returns one that adds kv to every line. The packages of this module name themselves (component=edge, ...) through it when a Logger is one.

func NewSlogLogger ¶

func NewSlogLogger(h slog.Handler) FieldLogger

NewSlogLogger returns a FieldLogger that writes to the slog handler h, at the slog levels of the same names.

func NewStdLogger ¶

func NewStdLogger(l *log.Logger, debug bool) FieldLogger

NewStdLogger returns a Logger that writes to l (the standard logger when nil), with the level in front of each line, from Info up; NewStdLogger with debug true writes Debug lines too.

type Logger ¶

type Logger interface {
	Debugf(format string, args ...any)
	Infof(format string, args ...any)
	Warnf(format string, args ...any)
	Errorf(format string, args ...any)
}

Logger receives the log of the edge nodes, host applications and applications of this module: set it as the Logger of their configuration. A nil Logger logs nothing. Debug is the detail of every publish and subscribe; Info, what changes (a state transition, a rebirth); Warn, what failed and is retried; Error, what fails a call or stops work.

A Logger is called from many goroutines, and must not block.

func ComponentLogger ¶

func ComponentLogger(l Logger, name string) Logger

ComponentLogger returns the Logger a package of this module uses for l: NopLogger for nil, and for a FieldLogger one with component=name.

func NopLogger ¶

func NopLogger() Logger

NopLogger returns a Logger that logs nothing.

type RetryPolicy ¶

type RetryPolicy interface {
	ShouldRetry(attempt int, err error) (retry bool, wait time.Duration)
}

RetryPolicy decides whether a failed connection or publish is made again, and when: the edge nodes, host applications and applications of this module take one for their reconnection. attempt is the number of the attempt that failed, from 0. A policy is called from many goroutines.

func NoRetry ¶

func NoRetry() RetryPolicy

NoRetry returns a RetryPolicy that never retries.

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
app
edge
examples
aliases command Example: Edge Node with metric aliases for bandwidth-efficient DATA messages.	Example: Edge Node with metric aliases for bandwidth-efficient DATA messages.
application command
commands command Example: sending NCMD and DCMD commands from a Host Application.	Example: sending NCMD and DCMD commands from a Host Application.
datasets command
edge-node command
host-app command
server-walking command
templates command
host
mqtt
payload
proto
topic

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Repository	Description
sparkplugbctl	CLI for monitoring, publishing, simulating and debugging Sparkplug B infrastructure
sparkplugb-interop	Reference Sparkplug B edge nodes and host applications (Eclipse Tahu, pysparkplug, SparkplugNet, srad, sparkplug-client, sparkplughost) as fixture-driven containers, which `make interop` runs this library against

README ¶

go-sparkplugb

Features

go-sparkplugb vs other Sparkplug B stacks

Compatibility matrix

Installation

Packages

Quick Start — Edge Node

Quick Start — Host Application

Quick Start — Application

Quick Start — Templates

Quick Start — DataSets

Examples

Configuration

Edge Node Config

Host Application Config

Application Config

Connection loss

Specification Conformance

Conformance Summary

Project Structure

Building and Development

Further Reading

Related Projects

License

Documentation ¶

Index ¶

Constants ¶

Variables ¶

Functions ¶

Types ¶

type ExponentialBackoff ¶

func (ExponentialBackoff) Delay ¶

func (ExponentialBackoff) ShouldRetry ¶

type FieldLogger ¶

func NewSlogLogger ¶

func NewStdLogger ¶

type Logger ¶

func ComponentLogger ¶

func NopLogger ¶

type RetryPolicy ¶

func NoRetry ¶

Source Files ¶

Directories ¶